安氏Ⅱ类2分类错患者上颌前牙区唇侧牙槽骨厚度研究

Measurement of labial alveolar bone thickness of Angle ClassⅡDivision 2 patients in maxillary anterior region with cone-beam CT

目的以锥形束CT（conebeamcomputedtomography，CBCT）技术对安氏Ⅱ类2分类错患者与正常人群上颌前牙区的牙齿唇侧骨壁厚度进行测量并对比研究，为临床上正畸牙移动范围提供参考依据。方法选取安氏Ⅱ类2分类错患者30例（男女各半），另选取正常体检人群30名为对照组（男女各半），年龄均为18~25岁。全部研究对象拍CBCT，并通过软件对上颌前牙区每颗牙齿的3个位点（根颈、根尖、根中）唇侧骨壁进行测量，并对结果进行统计学分析。结果同一样本左右两侧同名牙测量值差异均无统计学意义（P＞0.05）。不同性别同名牙对比结果显示：安氏Ⅱ类2分类错组与对照组男性与女性在多个位点骨壁厚度差异有统计学意义（P＜0.05）。安氏Ⅱ类2分类患者组与对照组间对比结果，中切牙和侧切牙的L1、L3，尖牙的L1、L2、L3比较差异均有统计学意义（P＜0.05）。结论安氏Ⅱ类2分类错患者和正常人群左右同名牙的牙槽骨壁厚度基本对称，男性骨壁较女性更厚。安氏Ⅱ类2分类错患者上颌前牙区牙颈部与根中部的唇侧骨壁厚度相比正常人更薄。

Objective The aim of this study is to measure the labial alveolar bone thickness of the Angle Ⅱ,Division 2 patients and healthy adults with CBCT technique, in order to provide reference for clinical dental orthodontic design. Methods Sixty cases were consecutively selected from the Fourth Affiliated Hospital outpatients of Inner Mongolia Medical College. They were divided into the case group and control group. Each group contains 30 patients (15 men and 15 women). CBCT was used to scan maxillofacial region and 3D models were made on computer, software was used to measure labial alveolar bone thickness in three points of the teeth (the root, central and apical). Analyze the result finally. Results There was no significant difference between contralateral teeth. There was significant difference between the Angle Ⅱ, Division 2 patients and control group in different gender. There was significant difference between the case and control group in the thickness of incisor L1, L3, lateral incisor of L1, L3 and canine of L1, L2, L3. Conclusions There is no difference in the thickness of labial alveolar bone wall of the same tooth in both groups. Maxillary anterior labial bone wall of male is thicker than female?? in both groups. The maxillary anterior region of labial bone of Angle Ⅱ, Division 2 patients is thinner than normal adults in thecontrol group.